Container's UID could clash with host's UID Affecting Container service in Kubernetes
Severity Framework
CCSS (Common Configuration Scoring System) is a set of measures used to determine the severity of the rule.
Snyk CCSS
Rule category
Each rule is associated with a high-level category. For example IAM, Container, Monitoring, Logging, Network, etc.
Containers/ Best Practices
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CIS-Controls
- Snyk IDSNYK-CC-00615
- creditSnyk Research Team
Description
UID of the container processes could clash with host's UIDs and lead to unintentional authorization bypass.
How to fix?
Set securityContext.runAsUser value to greater or equal than 10'000. SecurityContext can be set on both pod and container level. If both are set, then the container level takes precedence.
Set security_context.run_as_user value to greater or equal than 10000.
Example Configuration
resource "kubernetes_pod" "allowed" {
metadata {
name = "terraform-example1"
}
spec {
container {
image = "nginx:1.7.9"
name = "example"
env {
name = "environment"
value = "test"
}
port {
container_port = 8080
}
security_context {
run_as_user = 20000
}
}
dns_config {
nameservers = ["1.1.1.1", "8.8.8.8", "9.9.9.9"]
searches = ["example.com"]
option {
name = "ndots"
value = 1
}
option {
name = "use-vc"
}
}
dns_policy = "None"
}
}